The trip you are planning is called the Down East Circle Route
Well, you are planning some of the loop anyway.
If you google
Down East Circle Route
a lot of blogs with tons of info
will come up.
The 2nd edition of the cruising guide "Down East Circle Route"
is due out this spring May/Jun 2011.
It is a terrific resource for the St. Lawrence River (playing the currents, marinas and anchorages, site-seeing, fuel
Tips etc.). The course then takes you into the Northumberland Strait, which is pretty shallow but the guide gives info on recent reported depths and harbour dredgings (anchorages etc). It then will take you down the Nova Scotia
coast and over to Maine
The book is by Cheryl Barr (Yacht Pilot Publishing)
there is an faq page if you go to Yacht Pilot Cruising Guides - FAQ
Wow, 10 feet sure is a lot of draft